package com.lagou.handler;

import com.lagou.rpc.RpcRequest;
import com.lagou.service.UserServiceImpl;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

/**
 * 自定义的业务处理器
 */
@ChannelHandler.Sharable
@Component
public class UserServiceHandler extends ChannelInboundHandlerAdapter implements ApplicationContextAware {

    private ApplicationContext applicationContext;

    //当客户端读取数据时,该方法会被调用
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        //注意:  客户端将来发送请求的时候会传递一个参数:  UserService#sayHello#are you ok
        //1.判断当前的请求是否符合规则
//        if (msg.toString().startsWith("UserService")) {
//            //2.如果符合规则,调用实现类货到一个result
//            UserServiceImpl service = new UserServiceImpl();
//            String result = service.sayHello(msg.toString().substring(msg.toString().lastIndexOf("#") + 1));
//            //3.把调用实现类的方法获得的结果写到客户端
//            ctx.writeAndFlush(result);
//        }

        if (msg instanceof RpcRequest) {
            RpcRequest rpcRequest = (RpcRequest) msg;
            Class<?> clazz = Class.forName(rpcRequest.getClassName());
            Object bean = applicationContext.getBean(clazz);
            Method method = clazz.getMethod(rpcRequest.getMethodName(), rpcRequest.getParameterTypes());
            Object result = method.invoke(bean, rpcRequest.getParameters());
            ctx.writeAndFlush(result.toString());
        }

    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}
